Error while access Activiti 5.17 REST service in Weblogic 12c

I got null pointer errror while access REST service in weblogic environmnet in Activiti 5/17/

Any thought?????

Error 500–Internal Server Errorjava.lang.IllegalArgumentException: ServletContext must not be null at org.springframework.util.Assert.notNull(Assert.java:112) at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:109) at org.springframework.web.context.support.WebApplicationContextUtils.getWebApplicationContext(WebApplicationContextUtils.java:99) at org.springframework.web.filter.DelegatingFilterProxy.findWebApplicationContext(DelegatingFilterProxy.java:305) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:250) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:74) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3288) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3254) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57) at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2163) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2089) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2074) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1513) at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:254) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256) at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)